Robertshaw 570B Betriebsanleitung
1
Avoid Catastrophic Failure
Protect your rotating or reciprocating
machinery, including pumps, motors, fans,
blowers, gear boxes, compressors, turbines
and other machinery from excessive vibration.
Vibration monitoring will alert you of
increasing machine vibration levels so
preventative maintenance can be scheduled
before catastrophic failures occur.
General Description
Robertshaw’s model 570B is a loop powered
(12 – 36 VDC) vibration transmitter that
provides a 4-20 mADC output proportionate
to vibration. The transmitter is available with
a variety of acceleration and velocity ranges.
This rugged (316L Stainless Steel, NEMA 4X,
IP68) compact unit provides continuous
monitoring of machine vibration for trending,
alarm and/or shutdown when used with a
PLC, computer, DCS, data logger or current
relays.
Installation is simple and no calibration is
required. A 1/4-28 tapped hole and a 1/4-28
stud is provided for mounting. The unit has a
2 pin connector and mates with a standard
MIL-C-5015 2 socket connector with splash-
proof boot for a weatherproof, splash-proof
connection. Optional cable assemblies are
available in lengths of 16, 32, 64 and 112 feet.
Sales Manual Section 140
Product Specification Model 570B
Loop Powered Stud Mount
Vibration Transmitter
Cable Sold Separately
Features and Benefits:
•Two wire loop powered (12 – 36 VDC)
•4 – 20 mADC output (isolated)
•Compact design, 1.12” diameter, 2.80”
height
•Corrosion resistant (316L Stainless
Steel)
•NEMA 4X, IP68, hermetically sealed
enclosure
•ESD and EMI protection
•Overload protection
•Reverse wiring protection
•Available for either acceleration or
velocity measurement
•CE Certified
•No Trim Pots required
2
ORDERING INFORMATION
AND MODEL NUMBERS
Key Model Number
DESIG. DESCRIPTION
570B 2-wire, 12-36 VDC Stud Mount
Vibration transmitter. 4-20 mADC
output.
Table 1 - Measurement
DESIG. DESCRIPTION
A Acceleration, 0 - 5 G peak
B Acceleration, 0 - 10 G peak
C Acceleration, 0 - 20 G peak
D Velocity, 0 - 0.5 IPS peak
E Velocity, 0 - 1 IPS peak
F Velocity, 0 - 2 IPS peak
Accessory Items*
PART NO. DESCRIPTION
086568A0016 Standard Cable - 16 foot, 2 conductor
shielded cable, MIL-C-5015 2 socket
connector with splash-proof boot.
086568A0032 Standard Cable - same as above
except 32 foot
086568A0064 Standard Cable - same as above
except 64 foot
086568A0112 Standard Cable - same as above
except 112 foot
086568B0016 IP68 Cable - 16 foot, 2 conductor
shielded cable, MIL-C-5015 2 socket
connector with splash-proof boot
086568B0032 IP68 Cable - same as above except
32 foot
086568B0064 IP68 Cable - same as above except
64 foot
086568B0112 IP68 Cable - same as above except
112 foot
* 16 foot standard cable is a stock item.
For other cables allow 6-8 weeks delivery.
Cable accessory must be ordered separately.
SPECIFICATIONS
DYNAMIC
Output (±5% of span) ……………..……....… 4 – 20 mADC
Vibration Range ………………………..…..…… See Table 1
Frequency Response-Acceleration:
- 3 dB …..………………….….…... 2 Hz – 2 kHz
Frequency Response-Velocity:
- 3 dB …..…………………..…… 2 Hz – 2.5 kHz
Repeatability ………………………………..………..... ±2%
Resonant Frequency, mounted, nominal ………..…… 18 kHz
Transverse Sensitivity, max. …………..…………..…….. 5%
ELECTRICAL
Power Requirements (Two wire loop power):
Voltage Source …………….....12 VDC – 36 VDC
Loop Resistance ……….…………………….……. see page 4
Grounding ………….………………………….. case isolated,
internally shielded
Protection ………………….……… reverse wiring, overload,
ESD & EMI
ENVIRONMENTAL
Temperature Range ….…….… -40°to 85°C (-40°to 185°F)
Vibration Limit ……………………………………250 g peak
Shock Limit ………………………………….…. 2,500 g peak
Electromagnetic Sensitivity, equiv. g …………... 10 µg/gauss
Sealing ………………………….. hermetic, NEMA 4X, IP68
PHYSICAL
Sensing Element Design …..…………...…PZT ceramic/shear
Weight ……………………………………………..162 grams
Case Material ………………………….... 316L stainless steel
Case Rating ………………………………... IP68, NEMA 4X
Mounting ……………………………..… 1/4 – 28 tapped hole
Supplied Accessories …………………. 1/4-28 mounting stud
Output Connector ………………….….... MIL-C-5015, 2-pin
Pin A ……………………………………. plus (+)
Pin B …………………………………….minus (-)
Cabling ……………………………… two conductor shielded
(see Accessory Items Table)
Torque Limit ………………………………... 30 in. lbs. Max.
Warranty ………………………………………………. 1 year
CERTIFICATIONS
CE
3
Mounting Instructions
The mounting point on the structure should be
faced to a diameter of 1.25 inches. For
measurements involving frequencies above 1 kHz,
the surface should be flat within 1 mil and have a
surface texture no greater than 32 micro-inches.
The tapped hole must be perpendicular to the
mounting surface and at least two threads deeper
than the stud. This will prevent a gap between the
transmitter and the mounting surface producing
optimum frequency response.
Proper screw torque on the mounting stud is also
required. Under-torquing the transmitter reduces
the stiffness of the coupling. Over-torquing can
cause permanent thread damage to the transmitter.
It is recommended that the 1/4-28 stud be torqued
to a value of 30 inch-pounds.
SURFACE 32 1.25″DIA MIN
FINISH
.004 A
.001
-A-
.35
.25
Before stud mounting the transmitter, a coupling
fluid should be applied to the mating surfaces.
The coupling fluid protects the mounting surface
and optimizes the frequency response by
increasing the coupling stiffness. Suggested
coupling fluids are machine oil or vacuum grease.
It is recommended that a thread adhesive such as
Loctite 222 be used.
Cable Routing and Electromagnetic
Interference
Walkie-talkies, power lines, or even electrical
sparks may cause signal interference. The
following guidelines will eliminate many
measurement errors due to electromagnetic
radiation and electrostatic discharge (ESD).
Assure that high quality, well shielded cables are
used. If cable splices are made, complete
shielding must be maintained.
Proper cable routing is imperative. Never run
transmitter cable alongside AC power lines; cables
must cross AC power lines at right angles. Where
possible, provide a separate grounded conduit to
enclose the transmitter cable. In addition, route
the cable away from radio transmission
equipment, motors/generators, and transformers.
Finally, avoid routing the cable through areas
prone to ESD. Even though transmitters are
protected against ESD failure, temporary
distortion signals may appear at the output.
Cable Grounding and Ground Loops
In order to provide proper shielding and prevent
ground loops, cable grounding should be
carefully considered.
For transmitters using two conductor shielded
cable, the power is carried on one lead and the
return on the other. The cable shield serves to
protect the signal from ESD and electromagnetic
interference (EMI). The shield should be
grounded at only one point.
Cable Anchoring
After mounting the transmitter, the cable should
be anchored to reduce stress at the cable
terminations. When securing the cable, leave
enough slack to allow free movement of the
transmitter.
4
LOOP RESISTANCE
Maximum loop resistance can be calculated by:
V power – 12 V
RL(max) =
20 mA
Loop resistance is the sum of the wiring resistance and
the load resistance.
Typical
POWER SOURCE
VOLTAGE
RL(max)
20 400 Ω
24 600 Ω
26 700 Ω
Reference: Robertshaw cable resistance is 40 Ω
per thousand feet.
Typical Circuit
White
Pin A
DC Power
Pin B Black Supply
RLoad
Model 570B
Signal Measuring Circuit
Due to continued research and development, the manufacturer
reserves the right to amend these specifications without notice.
Q-4166 (8/01) Printed in U.S.A.
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